Oil well pump



T. G. LEWIS OIL WELL PUMP Nov. 25, 1947.

Filed July 11, 1945 3 Sheets-Sheet 1 zalewz's s3, WiW

Nov. 25, 1947. v T. s. LEWIS 2,431,492

OIL WELL PUMP Filed July 11, 1945 3 Sheets-Sheet 2 Npv. 25, 1947.

T. G. LEWIS OIL WELL PUMP Filed July 11, 1945 s Sheets-Sheet s gwuc/rvfow WIQM Patented ov. 25, 1947 OIL WELL PUMP Truman G. Lewis, Reseda, Calif., assignor to William G. Klein, Tarzana, Calif.

Application July 11, 1945, Serial No. 604,327

Claims. 1

The present invention relates to a new type of oil well pump which will eliminate the use of sucker and pull rods, usually required in apparatus of this character and known to be a source of considerable trouble and expense.

The object of my invention is the provision of a submersible deep oil well pump comprising three pump structures or stages, one above the other and each consisting of a pair of pumps operated in opposite phase by a rotating disc in clined to a driving shaft common to all stages. The outlets of the pumps on one side of the pump shaft are connected to oneanother.

While I have disclosed three pump stages each comprisin'g a pair of pumps I do not wish to limit myself to any particular number of stages and/ or number of pumps in a stage.

A still further object resides in providing a device of this character which is comparatively simple and durable in construction, inexpensive to manufacture and one which will be very efllcient and useful in operation.

In the drawings:

Figure 1 is a side view of my pump;

Figure 2 is an enlarged central longitudinal section on line 2-2 of Figure 1;

Figure 2a is an enlarged central longitudinal section on line 2a of Figure 1;

Figure 2b is an enlarged central and longitudinal section on line 2b-2b of Figure 1;.

Figures 3 and 4 are transverse sections on lines 3-3 and 4-4 respectively of Figure 2;

Figure 5 is a longitudinal detail section on line 55 of Figure 4.

Referring to Figures 1- -21; of the drawings in which like reference characters designate like or similar parts, it is seen that 2 denotes a hollow casing pump closed at its bottom end and comprising a plurality of sections connected by threads or otherwise. A base plate 3 rests upon the bottom of the casing and supports a bearing plate 4 having a central lower ball bearing 5 for the lower end of a shaft 6 of an electric motor 1 housed in the lower portion of the casing and also surrounded by a lining 8. A power cable 9 which conducts the electric power to the motor, extends upwardly alongside the pump to a source of electric energy (not shown).

The upper end Ill of the motor shaft extends through an upper ball bearing H mounted in a cylindrical plate 12 which is threaded upon its periphery and on either side of an intermediate flange IS. The latter extends between adjacent ends of the two lower casing sections each threaded upon a threaded portion of the plate 2 and thus connected together in a fluid-tight manner.

The motor shaft carries at its upper end a spur gear 14 which drives a speed reducing gear train now to be described and meshes with a larger gear I5 on a shaft I6. The lower end of the latter is journaled in a ball bearing I! supported in an excentric depression in the plate l3. Shaft l8 extends upwardly through a plate 18 fixed in the casing and carries on its upper end above the plate I8 a gear 19 which meshes with a larger gear 20 on a shaft 2| journaled in a ball bearing 22 mounted in a depression in the plate l8. Above the latter a lining 23 is provided in the cylinder. The shaft 2| extends through a plate 24 fixed in the lining and carries at its upper end above such plate a gear 25 meshing with a larger gear 26 on a shaft 21 the lower end of which is journaled in a bearing 28 countersunk in plate 24. Above the plate 24 the lining is thicker. Shaft 21 extends through a plate 29 fixed in the lining and has upon its end above the plate a gear 30 meshing with a larger gear St on a shaft 32 journaled in a bearing 33 countersunk in plate 29.

Shaft 32 passes through ,a transverse partition 34 formed in the casing and carries on its upper end above the partition a gear 35 in mesh with gear 36 on shaft 31 the lower end of which is journaled in the partition while the upper end is journaled in a plate 38 which is a substantial duplicate of plate I2 previously described.

The gear 36 is in mesh with the gear 39 on the lower end of shaft 40 extending through plate 38 and is journaled in a ball bearing 4| countersunk in the latter; shaft 40 has a flange 42 resting on the last named bearing and extends upwardly and operates a plurality of pumps in a manner now to be described (Figure 21a).

Shaft 40 operates the pumps by means of three generally elliptical discs 43 which have central elongated apertures 44 of a width permitting the passage of the pump shaft and of a length permitting their inclination to the shaft. Each disc has also a bolt opening extending at right angles to the length of the described Opening for the shaft and registering with a diametral bolt opening in the latter for a bolt 45 with double nuts 46. at either end which may be tightened to hold the disc at a predetermined inclination. The

outer surfaces of the discs are substantially parallel to the interior surface of the cylinder, and the inclination of the bottom and top discs is the opposite of that of the intermediate disc (Figures 2, 2a). a

Each disc cooperates with a pair of pump piston rods 41 working alternately and in opposite phase. The bottom ends of these piston rods have each a hemi-spherical cavity for a ball 48 held therein by a ring 1' and taking the upward thrust of the disc. The bottom ends of the piston rods have flanges 49 which function as abutments for coil springs 50 each encircling a piston rod and urging it out of a bore in the pump housing i in which the piston is reciprocally mounted. The pump housing 5! takes the form of a cylindrical block with reduced and threaded upper and lower ends which are screwed into the adjacent sections of casing 2. Either of the two lower pump housings is axially apertured 52 for the passage of the pump shaft and the top pump housing has a socket 53 closed at the top and containing a ball bearing 54 in which the upper end of the pump shaft is journaled.

In each pump housing are formed two diametrally opposite piston chambers 55 which are concentric with and continuous of the bores in which the piston rods are reciprocally mounted. The latter carry upon their upper and inner ends a piston 56 each working in a chamber. The upper end of each chamber is enlarged and interiorly threaded for engaging a threaded valve plug 51 which has a central chamber 58 with a valve ball 59 and a correspondingly shaped b0ttom surface and is during the power or exhaust stroke connected by a narrower passage 60 with the piston chamber.

While I have particularly described the elements best adapted to perform the functions set forth, This. obvious that various changes in form, proportion and in the minor details of construction may be resorted to, without departing from the spirit or sacrificing any of the principles of the invention.

What I claim is:

1. In a deep well pump, a pump casing adapted to be submerged in the liquid in the bottom of a well, said casing having a closed lower end, an electric motor disposed in the lower part of the casing, a shaft connected to and driven by the motor and extending upwardly through the casing, a cam disk keyed to the shaft and disposed obliquely to the axis of the shaft and casing, a pump housing, forming a part of the casing, having a plurality of pump cylinders formed therein and disposed longitudinally of the casing, a piston reciprocally disposed in each cylinder, a piston rod projecting from a corresponding end of each cylinder and outwardly of an end of the pump housing, said piston rods having free ends disposed to be engaged by the cam disk, when revolved, and forced inwardly of its cylinder therei by, for causing the piston thereof to execute its A perforated plate or screen s in the upper end i of each valve chamber 58 limits the upward dis;

placement of the ball therein.

Beneath the valve plug of each pump-:is-am outwardly extending passage 6i which communicates with the piston chamber and an-inlet valve chamber 62 which is closed at the upp endxbyli a threaded plug 63 and houses a valve ball 64" resting on the correspondingly shaped bottomof the valve chamber. When the ballldurl x-the suction stroke of the piston is ,,lifted,-;the= inl'et valve chamber is in communication; through: a narrow passage 65 with the inlet conduit '56 which communicates with the exterior of thepump cas- The valve plug chambers of the two .lower pumps or stages are connected at the top to the- The passage 69 in the intermediate pump housing is connected to the funnel shaped end 61 of that pump and the passage 69 in the top housing empties at its upper end into the space above that housing. Thus it is seen that the outlets of the pumps on one side of the pump shaft are connected to one another.

To operate the pump structure described and illustrated the connection of cable 9 to a source of electrical energy will start the motor, rotating the pump shaft and the inclined discs thereon. Figure 2, 2a can be considered as representing the condition of the pump structure at the beginning of the operation. Since the right -hand piston of the lowermost and top stages are in retracted or extreme suction position 011' has entered through the inlet valves 6 l66 and filled the right-hand piston chambers of these stages. During the ensuing power stroke of the righthand pistons of these stages, oil will be expelled from these piston chambers through the outlet valves and conduits 61, 68, 69 to the chamber above the top pump housing.

A description of the operation of the left-hand pumping stroke, a conduit for conveying a pumped medium from each cylinder and provided with a one way valve opening away from its associate cylinder, means for causing the pistons and piston rods to move in the opposite direction when released by the cam disk for executing the opposite, suction strokes of the pistons, and lateral ports extending from externally of the casing and opening into each cylinder, said ports having inwardly opening, one way valves.

2. A deep well pump as in claim 1, and reduction gear means interposed in the casing between sections of said shaft, for coupling said sectionsposed relatively to the axis of the pump casing and being circumferentially spaced from one another to be alternately or successively actuated by the cam disk, when the shaft is revolved.

4. A deep well pump as in claim 1, and a second and third pump housing mounted in the pump' casing and spaced from said first mentioned pump housing in a direction longitudinally of the easing, said last mentioned pump housings corresponding to the first mentioned pump housing and including pistons and piston rods, said shaft extending axially through said pump housings and being Journaled therein, a second and third cam disk keyed to the shaft and disposed for engagement with the piston rods of the second and third pump housings, respectively, and said pump housings each having transverselydisposed, valve controlled inlet passages and upwardly opening, valve controlled outlet passages.

5. A deep well pump as in claim 1, and a second and third pump housing mounted in the pump casing and spaced from said first mentioned' pump housing in a direction longitudinally of the casing, said last mentioned pump housings corextending axially through said pump housings and being journaled therein, and a. second and third cam disk keyed to the shaft and disposed for engagement with the piston rods of the second and third pump housings, respectively, the uppermost and intermediate pump housings having longitudinal passages extending therethrough, and conduits extending from the outlet ports of the pump cylinders of the lower and intermediate pump housings and connected with the passages of the pump housings, located thereabove and with the passages of the pump housings located therebeneath, for forming continuous conduits from the lowermost pump housings to the upper end of the uppermost pump housing TRUMAN G. LEWIS.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

